Can a James Gunn movie still be a James Gunn movie without a Nathan Fillion appearance in some capacity? Thankfully we’ll never have to find out when it comes to Suicide Squad 2 a.k.a. The Suicide Squad.

Deadline reports that Nathan Fillion, star of ABC’s The Rookie and pop culture’s chill Canadian buddy, has joined the cast of The Suicide Squad. It is unknown who (or what) Fillion will be playing.

Fillion and Suicide Squad 2 director James Gunn have a long creative history together. Fillion starred in Gunn’s 2006 horror comedy debut Slither. He also turned up in 2010’s Super, and lent his voice to a hulking alien inmate in Guardians of the Galaxy.

Outside of his Gunn collaborations, Fillion has had a prolific career in genre movies and TV. Fillion first drew attention as villainous priest Caleb in season 7 of Joss Whedon’s Buffy the Vampire Slayer. He parlayed that into starring as Captain Malcolm “Mal” Reynolds in Wedon’s cult TV series Firefly, and its filmic followup, Serentiy. Fillion has starred in recent series Castle and The Rookie, and also guested in other projects like Big Mouth, Santa Clarita Diet, and The Venture Bros. Notabaly, Fillion is already a part of the extended DC universe, having voiced Green Lantern in animated features Reign of the Superman and Justice League: Doom.