He joins leads Kyle Chandler and Aaron Pierre and series regular Kelly MacDonald.
Nicholson will play the young version of John Senior.
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Cast also includes Poorna Jagannathan, Ulrich Thomsen and Jason Ritter.
J. Alphonse Nicholson, ‘Green Lantern’Paul Smith Photography/DC
The eight-episodeLanternsis produced by HBO in association with Warner Bros Television and DC Studios.
Mundy, who serves as showrunner, Lindelof and King are co-writing and executive producing.
James Hawes is directing the first two episodes and also exec producing.
Hes repped by CESD, AC Management and attorney Ryan LeVine.
