List of Beast Machines episodes

Season 1: 1999-2000

#	Title	Writer	Director	Original airdate	Production code
1	The Reformatting	Marty Isenberg, Bob Skir	William Lau	July 17, 1999 (BotCon 1999) August 14, 1999 (SDCC 1999) September 18, 1999 (Fox Kids)
Escaping from strange new foes and unable to transform, the four surviving Maximals encounter a mysterious supercomputer which converts them into powerful new warriors—and a new kind of Transformer.
2	Master of the House	Marty Isenberg, Bob Skir	Steve Sacks	August 14, 1999 (SDCC 1999) September 25, 1999 (Fox Kids)
Reformatted into new technorganic bodies, the Maximals come face to face with the source of their troubles.
3	Fires of the Past	Marv Wolfman	John Pozer	October 2, 1999
The Maximals are attacked by three new Vehicon foes, Tankor, Jetstorm, and Thrust.
4	Mercenary Pursuits	Michael Reaves	Raul Sanchez Inglis	October 9, 1999
The Maximals have a second run-in with the Vehicon Generals and Optimus senses the presence of a familiar Spark.
5	Forbidden Fruit	Steven Melching	Trenton Carlson	October 16, 1999
A new ally, Nightscream, offers a strange new energy supply, but is it a blessing or a curse?
6	The Weak Component	Rodney Gibbs	Andrew Currie	October 23, 1999
Frustrated by his inability to transform, and ashamed of his uselessness when he finally does, Rattrap makes a deal with the devil.
7	Revelations Part I: Discovery	Brynne Chandler Reaves	James Taylor	October 30, 1999
The Maximals discover what happened to the inhabitants of Cybertron, and Blackarachnia learns more about the Vehicon General, Thrust.
8	Revelations Part II: Descent	Marv Wolfman	William Lau	November 6, 1999
Cheetor and Rattrap make a surprising discovery about their missing memories and the identity of Tankor.
9	Revelations Part III: Apocalypse	Steven Melching	George Samilski	November 13, 1999
Nightscream pursues Jetstorm who has captured Blackarachnia's spark, meanwhile Optimus and Rhinox have a heart to heart.
10	Survivor	Brynne Chandler Reaves	Dennis Heaton	November 27, 1999
Megatron targets Nightscream for capture, so he can learn more about how Nightscream was able to survive the virus and obtain his beast mode.
11	The Key	Marv Wolfman	Sean Osborne	December 4, 1999
Tankor discovers an ancient weapon within the Oracle, none other than the Key to Vector Sigma!
12	The Catalyst	Robert N. Skir, Marty Isenberg	Steve Sacks	December 11, 1999
Rattrap uses a catalyst program to accelerate the growth of the plants at the Maximal stronghold, and Blackarachnia learns the truth about Thrust.
13	End of the Line	Steven Melching	Mark Sawers	December 18, 1999
Megatron and Optimus are set to go head to head with dueling doomsday weapons, and both seem willing to destroy Cybertron to gain victory.

Season 2: Battle for the Spark - 2000

#	Title	Writer	Director	Original airdate	Production code
14	Fallout	Marty Isenberg, Bob Skir	Raul Sanchez Inglis	Canada: February 9, 2000 U.S.: August 5, 2000
After releasing a weapon deadly to all "traditional" Transformers,Optimus Primal must face the consequences of his actions.
15	Savage Noble	Len Wein	Greg Donis	Canada: February 16, 2000 U.S.: August 19, 2000
The Maximals discover a strange new organic creature, but what secrets does Noble hide?
16	Prometheus Unbound	Marv Wolfman	Sebastian Brodin	Canada: February 23, 2000 U.S.: August 26, 2000
The Maximals infiltrate Megatron's fortress, but are betrayed by their new friend.
17	In Darkest Knight	Steven Melching	George Samilski	Canada: March 1, 2000 U.S.: September 2, 2000
Blackarachnia is finally able to free Silverbolt from his Vehicon mindset, but he doesn't seem too happy about it.
18	A Wolf in the Fold	Brynne Chandler Reaves	William Lau	Canada: March 8, 2000 U.S.: September 9, 2000
Intent on teaching Optimus the "purity" of a mindless, mechanical world, Megatron unleashes a new virus that turns the Maximals into their own worst enemies.
19	Home Soil	Meg McLaughlin	Dennis Heaton	Canada: March 15, 2000 U.S.: September 16, 2000
A spaceship crash-lands on Cybertron, releasing a tentacled alien monster. The Maximals and Vehicons both rush to take control of the secrets of the ship.
20	Sparkwar Pt. I: The Strike	Brooks Wachtel	Steve Sacks	Canada: March 22, 2000 U.S.: September 23, 2000
While searching for the missing sparks, the Maximals are attacked by two new Vehicon Generals, and Botanica must abandon her pacifistic ways to save them.
21	Sparkwar Pt. II: The Search	Michael Reaves	Gino Nichele	Canada: March 29, 2000 U.S.: September 30, 2000
The Maximals continue their search for the missing sparks.
22	Sparkwar Pt. III: The Siege	Steven Melching	Luke Carroll	Canada: April 5, 2000 U.S.: October 7, 2000
Having found the imprisoned sparks, the Maximals have to race against time to stop Megatron from consuming them and becoming a god.
23	Spark of Darkness	Nick Dubois	Greg Donis	Canada: April 12, 2000 U.S.: October 28, 2000
Megatron has been defeated, but zombies keep attacking the Maximals all over Cybertron.
24	Endgame Pt. I: The Downward Spiral	Michael Reaves	Angela Stevenson	Canada: April 19, 2000 U.S.: November 4, 2000
Under siege inside Megatron's floating fortress the Maximals must protect the captive sparks against Megatron's final push.
25	Endgame Pt. II: When Legends Fall	Steven Melching	George Samilski	Canada: April 26, 2000 U.S.: November 11, 2000
The Maximals make their last stand against Megatron and his Vehicon army.
26	Endgame Pt. III: Seeds of the Future	Robert N. Skir	William Lau	Canada: May 3, 2000 U.S.: November 18, 2000
As the last two sentient creatures on Cybertron, Optimus Primal and Megatron stage their final battle as the Beast Era draws to a close.