Sidelock

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Sidelock is an Autobot combiner from the Robots in Disguise portion of the Aligned continuity family.

"Unexpected."

Sidelock is the combined form of Sideswipe and Grimlock.

Fiction

2015 Robots in Disguise cartoon

While attempting to unravel the mysteries of how the Bee Team was able to combine into Ultra Bee, Fixit's experiments into combination (explosively) wound up merging Sideswipe and Grimlock into a single 'Bot with Sideswipe's upper body and Grimlock's lower. Neither was very amused by the experience, which (to their relief) wore off fairly quickly, allowing them to join the rest of the team in pursuit of Shadow Raker.Out of the Shadows