Actor Anthony Mackie teased new, epic line deliveries for the upcoming film "Avengers: Doomsday" during an interview at San Diego Comic-Con 2026 [1].

These developments signal a shift in the Marvel Cinematic Universe as Mackie continues to establish his identity as the new Captain America. By referencing the iconic "On your left" line from "Avengers: Endgame," Mackie suggests the new film will aim for similar cultural resonance while distinguishing his portrayal from that of Chris Evans.

Speaking with Entertainment Tonight correspondent Denny Directo, Mackie said the film would feature dialogue intended to rival the most memorable moments of previous installments [1]. The actor is currently promoting his role as the lead shield-bearer in the MCU's latest ensemble effort.

The film is scheduled to open in theaters on Dec. 18, 2026 [1]. This release date places the movie at the center of the winter blockbuster season, a traditional slot for major franchise entries.

Mackie's comments at the 2026 convention emphasize the pressure and opportunity of inheriting a legacy role. While the specific lines remain under wraps, the actor's focus on "epic" delivery suggests a high-stakes narrative for the characters involved [1].

The interview took place amid the broader festivities of San Diego Comic-Con, where fans gather for exclusive previews of upcoming theatrical releases [1].

“Mackie teases new, epic line deliveries for the upcoming film 'Avengers: Doomsday'”

The emphasis on creating new 'iconic' lines suggests that Marvel Studios is consciously attempting to transition the Captain America brand from the nostalgia of the Steve Rogers era to a new era defined by Sam Wilson. By explicitly comparing the upcoming dialogue to previous hits, the studio is signaling a desire to maintain the emotional and cultural impact of the original Avengers saga while evolving the character's voice.