Tā zài kàn yī bù guānyú Wéijīng hǎidào de diànshìjù.
He's watching a TV series about Viking pirates.
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Phonetic transliteration of 'Viking': 维 (wéi) for 'vi-', 京 (jīng) for '-king'. The History Channel series 《维京传奇》 (Vikings) made this term widely recognized in mainland Chinese pop culture in the 2010s. Note 维京人 = Viking (person); 维京时代 = Viking Age.