Tom Holland ’s back, swinging like his old self ... 'cause we have the first sighting on the "Spider-Man: Brand New Day" set since that scary concussion sent him to the ER.

Peep the clip -- Tom was fully back in action in London Thursday, diving into a major scene while the crew watched him web-sling back to form.

No Spidey suit yet, but Tom was all in during the rehearsal -- script in hand, scheming the scene, chasing that perfect web-slinging moment. Alamy

Filming’s back on after Tom’s mild concussion-stunt scare in late September ... no extra deets, but all signs point to Spider-Man being A-OK! Gallery Launch Gallery Getty

"Spider-Man: Brand New Day" -- with his fiancée Zendaya swinging alongside -- is set to hit screens July 2026 ... mark those calendars!

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