A Daniel Whitehall cameo in Avengers: Endgame would've thrown Agents of SHIELD's already-shaky canon status into further chaos. Across seven seasons of superhero-tinged spy shenanigans, Agents of SHIELD touched upon Hydra, Ghost Rider, Life Model Decoys, and plenty more Marvel hallmarks besides. Though Agents of SHIELD suffered no lack of top-level villains, Daniel Whitehall (later revealed as Hydra's Werner Reinhardt) was arguably the best of the baddies. Played by Reed Diamond, Whitehall worked under Red Skull, but was captured by SHIELD after World War II and given a stern interrogation by one Peggy Carter. Whitehall returned to prominence in the modern day, where he led Hydra and continued to pursue his previous experiments into Inhumans.
There's no question Daniel Whitehall stands among Agents of SHIELD's greatest villains… but whether he's an MCU villain is another matter altogether. Agents of SHIELD's relationship with MCU canon is up there with the Bermuda Triangle and D.B. Cooper in the halls of history's big unanswered questions. When Agents of SHIELD first premiered in 2013, there was no denying its link to the MCU. Phil Coulson's resurrection after getting impaled by Loki in The Avengers and the fall of SHIELD from Captain America: The Winter Soldier both became running plot points, while the likes of Nick Fury (Samuel L. Jackson) and Lady Sif (Jaimie Alexander) made cameo appearances.
Related: It's Time To Accept Agents of S.H.I.E.L.D. Isn't MCU Canon
While Agents of SHIELD's early seasons drew plenty of connections to MCU movies, the affection wasn't exactly reciprocated. Agents of SHIELD's only representation on the big screen has been Clark Gregg's Phil Coulson, but even then, there's precious little
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